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Kim, D.-W.,Protopapas, P.,Alcock, C.,Byun, Y.-I.,Kyeong, J.,Lee, B.-C.,Wright, N. J.,Axelrod, T.,Bianco, F. B.,Chen, W.-P.,Coehlo, N. K.,Cook, K. H.,Dave, R.,King, S.-K.,Lee, T.,Lehner, M. J.,Lin, H.- American Institute of Physics 2010 The Astronomical journal Vol.139 No.2
<P>We analyzed data accumulated during 2005 and 2006 by the Taiwan-American Occultation Survey (TAOS) in order to detect short-period variable stars (periods of <img entity='lsim' SRC='http://ej.iop.org/icons/Entities/lsim.gif' ALT='lsim' ALIGN='BASELINE' />1 hr) such as δ Scuti. TAOS is designed for the detection of stellar occultation by small-size Kuiper Belt Objects and is operating four 50 cm telescopes at an effective cadence of 5 Hz. The four telescopes simultaneously monitor the same patch of the sky in order to reduce false positives. To detect short-period variables, we used the fast Fourier transform algorithm (FFT) in as much as the data points in TAOS light curves are evenly spaced. Using FFT, we found 41 short-period variables with amplitudes smaller than a few hundredths of a magnitude and periods of about an hour, which suggest that they are low-amplitude δ Scuti stars. The light curves of TAOS δ Scuti stars are accessible online at the Time Series Center Web site (http://timemachine.iic.harvard.edu).</P>
Kim, Eungseok,Liu, Ning-Chun,Yu, I-Chen,Lin, Hung-Yun,Lee, Yi-Fen,Sparks, Janet D.,Chen, Lu-Min,Chang, Chawnshang American Diabetes Association 2011 Diabetes Vol.60 No.5
<P><B>OBJECTIVE</B></P><P>TR4 is a nuclear receptor without clear pathophysiological roles. We investigated the roles of hepatic TR4 in the regulation of lipogenesis and insulin sensitivity in vivo and in vitro.</P><P><B>RESEARCH DESIGN AND METHODS</B></P><P>TR4 activity and phosphorylation assays were carried out using hepatocytes and various TR4 wild-type and mutant constructs. Liver tissues from TR4 knockout, C57BL/6, and <I>db/db</I> mice were examined to investigate TR4 target gene stearoyl-CoA desaturase (<I>SCD</I>) 1 regulation.</P><P><B>RESULTS</B></P><P>TR4 transactivation is inhibited via phosphorylation by metformin-induced AMP-activated protein kinase (AMPK) at the amino acid serine 351, which results in the suppression of SCD1 gene expression. Additional mechanistic dissection finds TR4-transactivated <I>SCD1</I> promoter activity via direct binding to the TR4-responsive element located at −243 to −255 on the promoter region. The pathophysiological consequences of the metformin→AMPK→TR4→SCD1 pathway are examined via TR4 knockout mice and primary hepatocytes with either knockdown or overexpression of TR4. The results show that the suppression of <I>SCD1</I> via loss of TR4 resulted in reduced fat mass and increased insulin sensitivity with increased β-oxidation and decreased lipogenic gene expression.</P><P><B>CONCLUSIONS</B></P><P>The pathway from metformin→AMPK→TR4→SCD1→insulin sensitivity suggests that TR4 may function as an important modulator to control lipid metabolism, which sheds light on the use of small molecules to modulate TR4 activity as a new alternative approach to battle the metabolic syndrome.</P>
Seongjae Cho,Chen, R.,Sukmo Koo,Shambat, G.,Lin, H.,Namkyoo Park,Vuckovic, J.,Kamins, T. I.,Byung-Gook Park,Harris, James S. IEEE 2011 IEEE photonics technology letters Vol.23 No.20
<P>In this work, a whispering gallery mode (WGM) microdisk resonator based on Ge<SUB>1-</SUB><I>x</I>Sn<I>x</I> grown by molecular beam epitaxy (MBE) was fabricated and characterized. Various process conditions and different Sn contents (4% and 1%) were explored to confirm the feasibility of Ge<SUB>1-</SUB><I>x</I>Sn<I>x</I> for microcavity device operation. Optical modes with wavelengths in the infrared (IR) range beyond 1550 nm were successfully confined in the devices fabricated with different diameters, and free-spectral ranges (FSRs) near 20 nm were obtained.</P>
The back contact modification in high-efficiency Cu₂ZnSn(S,Se)₄ solar cells by a thin MoO₃ layer
Septia KHOLIMATUSSADIAH,Cheng-Ying CHEN,Wei-Chao CHEN,Yi-Rung LIN,Shao-Hung LU,Meng-Chia HSIEH,Jan-Kai CHANG,Chih-I WU,Ruei-San CHEN,Kuei-Hsien CHEN,Li-Chyong CHEN 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8
Semantic Recognition of Human Gestures Based on Spatial and Temporal Reasoning
Hsien-I Lin,Wei-Kai Chen,C. N. Huang,H. W. Wang 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
Gesture semantic recognition is a vital process of motion recognition. An accurate and stable recognition method helps to identify semantic meaning of a continuous motion. In this work, the semantic meaning is represented by a sequence of motion primitives. This work proposes a method based on spatial and temporal reasoning. Both spatial and temporal rules of motion primitives are used to estimate the current state of motion. The motion primitives adopted in this work are transport empty (TE), transport loaded (TL), grasp (G), and release (RL) from Gilbreth’s therbligs. The results show that the average recognition rate is 94.44% out of three different tasks.